Relational Databases

The concept of relational databases is that the data is linked into entities that give them relations. This is in order to minimise data duplication and attain data reliability.

In order to build a relational database, it is essential that a data model is formed to symbolize the data being stored. The required entities will be specified, which elements in which entities, and what relationships exist between the entities.

An important feature of relational models is the Many to Many Relationships which are removed and replaced with one to many Relationships. To recognize the relationship between entities a particular method is used, this method is called entity occurrence modelling. This is useful when a person has sample data.

Seperate tables-

Relational databases separate this mass of information into numerous tables. All the columns in each table should be about one topic, such as “student information,” “class information,” or “trainer information.”
The tables for a relational database are linked to each other through the use of keys. Each table may have one primary key and any
number of foreign keys. A foreign key is simply a primary key from one table that has been placed in another table.

Viewed in different ways-

Relational Databases can be viewed through forms and queries.